| 1. |
- Chiu, Justin NW, et al.
(författare)
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Cavern Thermal Energy Storagefor District Cooling
- 2018
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Annan publikation (refereegranskat)abstract
- Sweden currently accounts for 926 GWh of yearly district cooling production from forty one utility plants in 2015 (Statistics Sweden, 2016). The total potential cooling demand is estimated to be actually 2000-5000 GWh/yr (Swedish District Heating Association, 2017), increase in the cooling demand in the long run is thus expected. Nonetheless in the short term, large fluctuation between consecutive years has been observed: 10% increase in 2013 and 11% decrease in 2015 (Statistics Sweden, 2016). A successful transition and backup reserve solution is necessary to cope with such fluctuation, especially for DC network that is expending to reach out to additional customers.
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| 2. |
- Xu, Tianhao, et al.
(författare)
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Experimental and numerical investigation of a latent heat thermal energy storage unit with ellipsoidal macro-encapsulation
- 2022
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Ingår i: Energy. - : Elsevier BV. - 0360-5442 .- 1873-6785. ; 238
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Tidskriftsartikel (refereegranskat)abstract
- This paper investigates ellipsoid-shaped macro-encapsulated phase change material (PCM) on a component scale. The selected PCM is a paraffin-based commercial material, namely ATP60; differential scanning calorimetry and transient plane source method are used to measure ATP60's thermo-physical properties. A 0.382 m(3) latent heat thermal energy storage (LHTES) component has been built and experimentally characterized. The temperature measurement results indicate that a thermocline was retained in the packed bed region during charging/discharging processes. The experimental characterization shows that increasing the temperature difference between the heat transfer fluid (HTF) inlet temperature and phase-change temperature by 20 K can shorten the completion time of discharge by 65%, and increasing HTF inlet flowrate from 0.15 m(3)/h (Re = 77) to 0.5 m(3)/h (Re = 256) can shorten the completion time of charge by 51%. Furthermore, a one-dimensional packed bed model using source-based enthalpy method was developed and validated by comparison to experimental results, showing discrepancies in the accumulated storage capacity within 6.6% between simulation and experiment when the Reynolds number of the HTF inlet flow ranges between 90 and 922. Compared with a conventional capsule shaped in 69-mm-diameter and 750-mm-long cylinders, the ellipsoidal capsule shows 60% less completion time of discharge but 23% lower storage capacity. Overall, this work demonstrates a combined experimental and numerical characterization approach for applying novel macro-encapsulated PCM geometries for heating-oriented LHTES.
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